BT insecticide is a bacterial insecticide produced by fermentation of Bacillus thuringiensis. The scientific name of Bacillus thuringiensis is Bacillas thuringien-sis, and BT (or Bt) is an abbreviation. Bacillus thuringiensis was isolated in 1911 by German scientist Berliner in Suyun Jincheng, so it is called Bacillus thuringiensis. Commercial preparations for biological insecticides have been around for more than half a century. Up to now, 37 subspecies and 29 serotypes have been found to be effective against lepidopteran pests, and also to kill coleopteran pests. The beetle is better. There are four points to note when using Bt insecticides efficiently:
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First, master the reasonable application concentration Because the types of pests in the greenhouse are different, the sensitivity to BT insecticides is also different, so the application concentration is not the same. Only when the appropriate concentration is selected according to the sensitivity of the pest can a good control effect be obtained. 500-1000 times liquid can be used for cabbage caterpillars.
Second, determine the appropriate application time BT pesticides are slower than chemical pesticides, the application time should be 2-3 days earlier than the chemical pesticides, from the egg hatching period to the 1st instar larval stage The application is best.
Third, suitable temperature application Spray BT insecticide should be optimistic about temperature. When the glare and the temperature are above 25 ° C, it is preferred to apply at around 5 pm. It is necessary to spray the front and back of the blade when applying the medicine to improve the efficacy.
4. Scientific and rational mixing In order to improve the control effect of the medicine, especially when the pests occur, it can be mixed with various insecticides, but it should not be mixed with the fungicide .
In the case of large occurrence of pests and a mixture of various pests, avermectin or yinbao can be used, and BT plus insecticidal double-mixing spray can be used to achieve the purpose of concurrent treatment. In order to alleviate the resistance of pests to biological pesticides, BT, avermectin and nicotinic acid can be used interchangeably with chemical pesticides Ruijinte, Wanling and Taibao to avoid crop resistance.